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Sorption of Actinides in Various Oxidation States on TODGA-Containing TVEX from Nitric, Hydrochloric, and Perchloric Acid Media

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Abstract

The static capacity (SC) of the AXIONIT MND40T grade solid extractant (TVEX) based on a macroporous styrene-divinylbenzene copolymer and an extractant, tetraoctyldiglycol diamide (TOGDA), were determined during the sorption of actinide ions (Th, U, Np, and Pu) in various oxidation states in 3 M HNO3, HCl, HClO4 media. Despite the fact that a clear relationship between the SC value, the actinide oxidation state, and the type of acid was not found, in most cases there is the highest capacity of the sorbent in nitric acid solutions. In hydrochloric and perchloric acid media, the SC values, as a rule, decrease by several times. In general, the capacity of the AXIONIT MND40T sorbent decreases in the following order: An(IV) ˃ An(III) ˃ An(VI), where An is the actinide. The determination of the TODGA/An molar ratio in the solid phase of the sorbent showed that in all cases, except for the sorption of Pu(IV) from 3 M HNO3, the ratio was greater than 3, while in the REE(III) extraction with TODGA from nitric acid solutions, the molar ratio TODGA/metal at saturation was 3.

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Funding

The study was carried out with partial funding from the Ministry of Science and Higher Education of the Russian Federation.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, 119071, Moscow, Russia

    V. V. Milyutin, A. M. Fedoseev, V. P. Shilov & N. A. Nekrasova

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  1. V. V. Milyutin
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  2. A. M. Fedoseev
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  3. V. P. Shilov
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  4. N. A. Nekrasova
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Correspondence to V. V. Milyutin.

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Translated from Radiokhimiya, No. 2, pp. 172–176, April, 2022 https://doi.org/10.31857/S0033831122020083

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Milyutin, V.V., Fedoseev, A.M., Shilov, V.P. et al. Sorption of Actinides in Various Oxidation States on TODGA-Containing TVEX from Nitric, Hydrochloric, and Perchloric Acid Media. Radiochemistry 64, 171–175 (2022). https://doi.org/10.1134/S1066362222020084

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